performance: do not report extra details for failed app txns

[algorandskiy]

Summary

1. Disable expensive error details on app txn failure
2. Allow ERL to kick-in earlier if backlog gets congested
3. Allow ARL to count all transactions, not only post ERL (controller by TxBacklogAppRateLimitingCountERLDrops)
4. Set MaxConnectionsPerIP to 8 instead of 15

Test Plan

Existing tests

[codecov]

Codecov Report

Attention: Patch coverage is 79.41176% with 7 lines in your changes missing coverage. Please review.

Project coverage is 51.89%. Comparing base (7d4e23b) to head (ef6862d).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
data/txHandler.go	50.00%	3 Missing and 1 partial ⚠️
data/pools/transactionPool.go	33.33%	1 Missing and 1 partial ⚠️
util/rateLimit.go	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6171      +/-   ##
==========================================
+ Coverage   51.86%   51.89%   +0.03%     
==========================================
  Files         639      639              
  Lines       85435    85454      +19     
==========================================
+ Hits        44309    44345      +36     
+ Misses      38324    38305      -19     
- Partials     2802     2804       +2     

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[gmalouf]

Approved pending the handful of questions I added.

[algorandskiy]

Merged master in